Captain O-Ring - Power Pressure Washer O-Rings for 1/4" Quick Coupler, High Temperature Viton (10 pack) Viton Rubber is compatible with many chemicals and cleaners O-Rings measure 3/8" Inside Diameter x 0.100" Thick. These 3/8" o-rings are designed for 1/4" Quick Connect fittings found on many pressure washer wands and hoses. Compatible with temperatures up to 400F Tear and abrasion resistant. Comes in a package with 10 o-rings. Manufactured and warrantied by Captain O-Ring LLC